build(deps): bump ReactiveUI from 18.4.22 to 18.4.26 in /src

Bumps [ReactiveUI](https://github.com/reactiveui/reactiveui) from 18.4.22 to 18.4.26.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@18.4.22...18.4.26)

---
updated-dependencies:
- dependency-name: ReactiveUI
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

src/ReactiveUI.DI.Tests/ReactiveUI.DI.Tests.csproj

@@ -28,7 +28,7 @@
   </Choose>
 
   <ItemGroup>
-    <PackageReference Include="ReactiveUI" Version="18.4.22" />
+    <PackageReference Include="ReactiveUI" Version="18.4.26" />
   </ItemGroup>
 
   <ItemGroup>